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This is usually a driver issue. Reinstall the Mediatek USB VCOM drivers and try a different USB port/cable.

Even after careful setup, you may encounter error codes. Here are the most common ones for MT6877 devices and how to fix them.

Returning to an older OS version if the new one has bugs.

The official, industry-standard utility for MediaTek devices. For the MT6877 chip, you must use SP Flash Tool v6.x or higher. Version 6 natively supports the newer scatter file formats and partition structures required by Dimensity processors.

This article provides a comprehensive guide on what the MT6877 flash tool is, how to set it up, and how to flash your device safely. What is the MT6877 Flash Tool?

Universal MediaTek flashing, unbricking, and advanced partition management.

Because TWRP for MT6877 is rare (check XDA forums), you can use the flash tool to test-build one:

The refers to the MediaTek Dimensity 900 chipset, a high-performance 5G SoC commonly found in mid-range smartphones. Because it is a MediaTek-based chip, flashing operations generally require specialized software designed to communicate with the device's bootloader. Primary Flashing Tools for MT6877

Warning: Avoid selecting "Format All + Download" as it erases your unique IMEI numbers and network calibration data. Step 5: Execute the Flash

The bypass tool will detect the device and output a success message showing that SLA/DA security is disabled. Keep the phone connected. Step 3: Configure the Flash Tool

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Warning: Avoid choosing "Format All + Download" unless the device is completely hard-bricked, as this option will erase unique hardware calibration data, including your IMEI number and baseband configuration. Step 5: Execute the Flash Connection